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Debt (Schedule Of Short-term And Long-term Borrowings) (Details) - USD ($)
$ in Thousands
May 31, 2019
Aug. 31, 2018
Debt Instrument [Line Items]    
Total short-term borrowings $ 34,880 $ 23,600
Long-term borrowings 61,208 62,800
Total 96,088 86,400
Autoborrow Agreement [Member]    
Debt Instrument [Line Items]    
Total short-term borrowings 14,100  
Series A Notes [Member]    
Debt Instrument [Line Items]    
Current portion of long-term debt 800 800
Long-term borrowings 18,000 18,800
Revolving Credit Facility [Member]    
Debt Instrument [Line Items]    
Short-term borrowings 20,000 20,000
Long-term borrowings 43,208 44,000
Revolving Credit Facility [Member] | Autoborrow Agreement [Member]    
Debt Instrument [Line Items]    
Short-term borrowings $ 14,080 $ 2,800